The prefix and key name must be separated by a hyphen (-). For example:

Alt-F10 ctrl-bksp

Some keys are intercepted by Windows and are not passed on to Take Command. For example, Alt-Tab, Alt-Esc and Ctrl-Esc typically pop up a task list, or are used in switching among multiple tasks. Alt-space brings down a menu to control window size and position, etc. Keys which are intercepted by the operating system (including menu accelerators, i.e.Alt plus another key) generally cannot be assigned to aliases or with key mapping directives, because Take Command never receives these keystrokes. However, KEYSTACK can sendthem to Windows (though not to another application).

The above comments are based on common 101/102-key US-style keyboards. Some key combinations might not be available on some keyboards.